Low temperature steam reforming of methane: A combined isotopic and microkinetic study

P N Kechagiopoulos, S D Angeli, A A Lemonidou

Research output: Contribution to journalArticle

32 Citations (Scopus)
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Abstract

Low temperature steam reforming in combination with hydrogen selective membranes presents great potential of intensifying the classical industrial hydrogen production process via natural gas. This concept can lead to significant environmental and process benefits, such as reduced energy needs, milder material stability requirements and considerably simplified process layouts via e.g. avoiding the use of downstream WGS reactors. Ni and Rh based catalysts supported on La2O3-CeO2-ZrO2, already identified as active and stable at these conditions, are further investigated in the current work aiming at the elucidation of reaction kinetics. Temperature programmed experiments of methane conversion in steam reforming and decomposition modes in conjunction with isotopic investigations using CD4 are carried out, showing that cleavage of a C-H bond participates in the rate determine step, whereas steam derived intermediates do not. A thermodynamically consistent microkinetic model considering a comprehensive set of surface pathways is also developed. The model describes correctly experimental trends, predicting surface CH3 dehydrogenation to be rate limiting. Estimated model parameters further help elucidate the different catalysts’ activities. The combined approach presented shows potential to accelerate catalyst and process design efforts for the promising low temperature steam reforming hydrogen production process.
Original languageEnglish
Pages (from-to)238-253
Number of pages15
JournalApplied Catalysis B: Environmental
Volume205
Early online date12 Dec 2016
DOIs
Publication statusPublished - 15 May 2017

Keywords

  • methane steam reforming
  • microkinetic model
  • kinetic isotope effect
  • nickel rhodium

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